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<p>快排最重要的就是 partition 函数，<strong>i</strong> 记录第一个不小于 pivot 的位置：</p>
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<li>取数组中最后一个数字为 pivot，同时用 i 记录第一个位置；</li>
<li>遍历数组，比较每个数和 pivot；</li>
<li>数组内的值小于 pivot 时，进入循环；</li>
<li><strong>保证 i 是第一个不小于 pivot 的位置；</strong></li>
<li>i == j, i ++</li>
<li>i != j, 交换数组中 i 和 j，且 i++</li>
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<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">TreeNode</span> </span>{</span><br><span class="line"> <span class="keyword">int</span> val = <span class="number">0</span>;</span><br><span class="line"> TreeNode left = <span class="keyword">null</span>;</span><br><span class="line"> TreeNode right = <span class="keyword">null</span>;</span><br><span class="line"></span><br><span class="line"> <span class="function"><span class="keyword">public</span> <span class="title">TreeNode</span><span class="params">(<span class="keyword">int</span> val)</span> </span>{</span><br><span class="line"> <span class="keyword">this</span>.val = val;</span><br><span class="line"> }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
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<p><strong>记录 virtualenv 的使用</strong></p>
<p>创建 virtual env 环境，这里上来就报错：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">OSError: Command /root/.local/share/letsencrypt/bin/python2.7 - setuptools pkg_resources pip wheel failed with error code 2</span><br></pre></td></tr></table></figure>
<p>查到是由于多个版本的 virtualenv 冲突了，解决：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> python -V</span><br><span class="line"><span class="meta">$</span> pip -V</span><br><span class="line"><span class="meta">$</span> dpkg -l|grep virtualenv</span><br></pre></td></tr></table></figure>
<p>然后使用</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> sudo apt-get purge python-virtualenv python3-virtualenv virtualenv</span><br></pre></td></tr></table></figure>
<p>删除，重新安装：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> pip install virtualenv</span><br></pre></td></tr></table></figure>
<p>这里有可能又报错 <code>permission denied</code> ，查了好多地方，说是要加 <code>sudo</code> ，但其实不是这么解决的，正确的安装方法是：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">$</span> pip install virtualenv --user</span><br></pre></td></tr></table></figure>
<p>即为当前的用户安装 <code>pip</code> ，原来自己以前用 <code>pip</code> 的姿势都是错的 o(╥﹏╥)o，使用 <code>pip</code> 千万不要加 <code>sudo</code> 啊，真是学习不规范，使用两行泪〒▽〒</p>
<p>开启虚拟环境：</p>
<figure class="highlight shell"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line">// 查找解释器位置</span><br><span class="line"><span class="meta">$</span> find / -name python3</span><br><span class="line">// 指定 python3 创建干净环境</span><br><span class="line"><span class="meta">$</span> virtualenv --no-site-packages -p /usr/bin/python3 venv</span><br><span class="line"><span class="meta">$</span> source venv/bin/activate</span><br><span class="line">// 查看版本</span><br><span class="line"><span class="meta">$</span> pip -V</span><br><span class="line"><span class="meta">$</span> python -V</span><br></pre></td></tr></table></figure>
<p>然后就可以愉快的使用了。。。</p>
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<p><strong>总结一下排序的算法</strong></p>
<h4 id="选择排序"><a href="#选择排序" class="headerlink" title="选择排序"></a>选择排序</h4><p>思路： 找出数组中最大的元素和下标，将下标对应的元素从旧数组中取出依次存入新的数组中</p>
<p>复杂度 $O(n^2)$</p>
<figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">findMaxNum</span><span class="params">(arr)</span>:</span></span><br><span class="line"> maxNum = arr[<span class="number">0</span>]</span><br><span class="line"> maxNumIndex = <span class="number">0</span></span><br><span class="line"> <span class="keyword">for</span> i <span class="keyword">in</span> range(<span class="number">1</span>, len(arr)):</span><br><span class="line"> <span class="keyword">if</span> arr[i] > maxNum:</span><br><span class="line"> maxNum = arr[i]</span><br><span class="line"> maxNumIndex = i</span><br><span class="line"> <span class="keyword">return</span> maxNumIndex</span><br><span class="line"></span><br><span class="line"><span class="function"><span class="keyword">def</span> <span class="title">sort</span><span class="params">(arr)</span>:</span></span><br><span class="line"> newArr = []</span><br><span class="line"> <span class="keyword">for</span> _ <span class="keyword">in</span> range(len(arr)):</span><br><span class="line"> maxIndex = findMaxNum(arr)</span><br><span class="line"> newArr.append(arr.pop(maxIndex)) </span><br><span class="line"> <span class="keyword">return</span> newArr</span><br><span class="line"></span><br><span class="line">print(sort([<span class="number">5</span>,<span class="number">3</span>,<span class="number">6</span>,<span class="number">2</span>,<span class="number">10</span>]))</span><br></pre></td></tr></table></figure>
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<p>配个环境真是不容易，困难重重，到处是坑。。。</p>